• Title, Summary, Keyword: Ozonation

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Ozonation of Humic Acid with Heterogeneous Catalysts (불균일 촉매를 이용한 부식산의 오존 처리)

  • Rhee, Dong Seok
    • Journal of Industrial Technology
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    • v.29 no.A
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    • pp.89-94
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    • 2009
  • The efficiency of heterogeneous catalysts has been investigated in ozonation process for organic removal. Heterogeneous catalytic ozonation was conducted for the degradation of humic acid in the presence of Granular Activated Carbon or Zeolite as a solid catalyst. And the results were compared to those of ozonation alone and adsorption alone without ozonation. The degradation characteristics of humic acid in each process were examined with the values of pH, TOC, $UV_{254}$ and $COD_{Cr}$.

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Effect of Ozone Treatment for Nakdong River Raw Water - II. Removal of VOCs and Algae in Raw Water by Conducting Batch Test of Ozonation Experiments - (낙동강 상수원수의 오존처리 효과 - II. 회분식 오존처리에 의한 휘발성유기화합물 및 조류제거 효과 -)

  • 임영성;이홍재;이도진;허종수;손보균;조주식
    • Journal of Environmental Science International
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    • v.11 no.12
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    • pp.1267-1274
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    • 2002
  • This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using ozonation process. For raw water, Nakdong River was used. By conducting batch test of ozonation, the following results were obtained. When ozone dosage of $5 mg/{\ell}$ was used, ozone transfer and utilization efficiencies of the ozonation were 94 to 92%, respectively. Removal efficiencies of single VOC compound or mixed VOC compounds in the raw water were 80% to 90% by the ozonation with $2 mg/{\ell}$ dosage and 10 minutes contact time. Removal efficiencies of ABS by the ozonation with $1 mg/{\ell}$, $3 mg/{\ell}$ dosage and 20 minutes contact time were 83% to 96%, respectively. Almost 67% of chlorophyll-a at the concentration of $38.4\mu\textrm{g}/{\ell}$ was removed by ozonation at ozone dosage of $1 mg/{\ell}$ for 20 min. Considering the efficiency of ozone utilization and water treatment, the most effective ozonation could be obtained with high ozone dosage and short contact time.

A Study on the Ozonation of Dyeing Wastewaters (오존에 의한 폐수처리에 관한 연구 -염색폐수의 COD처리 및 탈색에 관하여-)

  • 김덕묵;강부부
    • Journal of the Korean Professional Engineers Association
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    • v.15 no.2
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    • pp.24-31
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    • 1982
  • This study concerns with the reduction of the COD and deceleration of dyeing wastewater from DAEGU city area by ozonation. The COD reduction by ozonation follows near linear relationships versus ozonation time, temperature and concentration. The color in dyeing wastewater and of dyes can he strikingly reduced as the water is quasi colorless after ozone treatment. COD reduction rate of wastewater was found not to be dependented on pH, however, high temperature gave better results, although economically not feasible. The ozonation of dyeing wastewater can give good results when dyes, scouring agent and sticking agents were pre-separated.

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Ozone disinfection criteria for contactor design (오존접촉조 설계를 위한 소독 기준)

  • Dumeau C;Boisdon V
    • 수도
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    • v.24 no.6
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    • pp.23-31
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    • 1997
  • Ozonation is an effective process in providing microbiologically safe drinking water. The operation of the ozonation stage is often based on disinfection criteria which include security factors, such as the CT criterion. This type of ozonation management, which mat include large safety margins, will no longer be possible, since formation of ozonation byproducts has to be avoided. In order to reduce the security factor, a computerized tool to predict with more accuracy inactivation of micro-organisms in the ozonation process has been developed.

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The Effect of Temperature and pH on Bromate Formation by Ozonation (오존처리시 Bromate생성에 미치는 온도 및 pH의 영향)

  • Lee, Mu Gang;Kim, Yeong Cheol;Choe, Jong Won
    • Journal of Environmental Science International
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    • v.13 no.7
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    • pp.667-674
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    • 2004
  • The objective of this study was to investigate the effects of pH and temperature on the formation of bromate, which is ozonation by-products, during ozonation. In this experiment, the operating parameters including pH 3 ~ 10 and temperature 15 ~ $30^{\circ}C$ were studied. Through the study for the bromate formation, reaction rate constant, and ozonation effect index on pH and temperature, the results obtained are as follows. At the same initial pH condition, the increase of pH shown similar trends even if the reaction variables such as temperature and reaction time of ozonation were exchanged. As pH and temperature were increasing, the bromate concentration was increased but bromine(HOBr+OBr) was decreased with increasing pH from 3 to 10. The activation energy(J/mol) for bromate formation decreased with increasing pH. The rate constants of bromate formation for the reaction of ozone and bromide, and ozone dosage coefficient$(K_{0})$ increased with temperature and pH. Ozonation effect index(OI) decreased with increasing temperature and pH.

Pre-Coagulation and Pre-Ozonation for Ozone Resisting Microfiltration Membrane Filtration System of a High Humic Contained Surface Water (고농도 휴믹성분이 포함된 강 원수에서 응집-침전 및 오존 공정을 전처리로 적용한 오존 내성막 pilot plant에서의 운전성 및 투과수 수질변화에 관한 연구)

  • Lee, Sanghyup;Yoshimasa, Watanabe;Lee, Seockheun;Ahn, Kyuhong
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.5
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    • pp.598-607
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    • 2004
  • In this study, the effects of two pre-treatment processes were observed prior to membrane filtration: pre-coagulation and pre-ozonation. To compare the effect of two above-mentioned pre-treatments, we adopted the four schemes: first one is direct membrane filtration of river surface water, second one is membrane filtration after pre-coagulation, third one is membrane filtration after pre-ozonation and fourth one is membrane filtration after pre-coagulation and pre-ozonation. There are two exceptional characteristics in applied processes. One is the usage of the MF membrane which has high ozone resisting characteristic. Therefore, ozone resides in membrane module during filtration. The other is adoption of Jet Mixed Separator (JMS) as coagulation-sedimentation process. The change in transmembrane pressure and permeate water quality were also examined. As a result, considering the filtration performance efficiency and permeate water quality, the process composed of filtration with combination of both pre-coagulation and pre-ozonation was proved most effective. The improved efficiency was due to the reduction of loading rate of fouling inducing materials to membrane module by coagulation process as well as variable reactions, such as degradation, particle destabilization and coagulation, occurred by residual ozone in membrane module. The additional effect of pre-coagulation before pre-ozonation is suppression of AOC, one of the by-products induced by ozonation. Therefore, combination of pre-coagulation and pre-ozonation is the effective process to overcome the major de-merit of ozonation i.e. by-products formation.

Distribution of viable indigenous bacteria in different sire fractions of ozonated soils

  • Yeong Hui, An;Hae Ryong, Jeong;Ji Won, Yang
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.162-166
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    • 2004
  • This study investigated tile effect of ozonation on indigenous microorganisms distributed in different size fractions of soil aggregates. Soil was ozonated from 0 to 300 minutes. The treated soils were fractionated into 3 groups (small, <53 $\mu$m; medium, 53-500 $\mu$m; and large, 2000-500 $\mu$m) and total heterotrophic bacteria in the soils were enumerated. Cell number decreased rapidly within 120 minute ozonation and showed slow decrease upon longer ozonation. Abundance of total heterotrophic bacteria in each fraction was in the following order regardless of ozonation time: small>medium>large fractions. Difference in microbial abundance among the fractions was smaller as ozonation time increased.

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Molecular size distribution of NOM after ozonation and its effect on adsorption with activated carbon (NOM의 오존처리에 따른 분자크기분포변화가 활성탄 흡착에 미치는 영향)

  • Lee, Hyung-Jik;Hong, Seong-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.27 no.6
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    • pp.805-813
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    • 2013
  • In this study, molecular size distribution of natural organic matter (NOM) after ozonation was measured and its effect on adsorption capacity of activated carbon was investigated. According to the results, the molecular size of NOM was limitedly changed. Specifically, the molecular size of NOM between 5,000 to 10,000 Da were slightly decreased with increasing ozone doses. The adsorption capacity after ozonation was evaluated using Freundlich isotherm with ideal adsorbed solution theory (IAST) which simulated the multi components adsorption. Further, mini-column test was conducted. The Freundlich constant, K was reduced after ozonation and the non-adsorbable fraction was increased with ozonation. However, no correlation between K and ozone doses was found. The present study also agreed with the correlation between adsorption capacity and pore size characteristics of activated carbon.

A Study of Ozonation Characteristics of Bis(2-chloroethyl) Ether (Bis(2-chloroethyl) Ether (BCEE)의 오존산화 특성에 관한 연구)

  • Lee, Cheal-Gyu;Kim, Moon-Chan
    • Applied Chemistry for Engineering
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    • v.21 no.6
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    • pp.610-615
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    • 2010
  • In this study ozonation of bis(2-chloroethyl) ether (BCEE) in aqueous solution was performed in a laboratory scale batch reacter. The ozonation process of BCEE was carried out by bubbling ozone at the bottom of reactor containing the BCEE solution. Ozonation was almost complete after 80 min with an ozone concentration of $50{\pm}10mg/L$. Ozonation treatment efficiencies of BCEE were evaluated in terms of $BOD_5$, $COD_{Cr}$, and TOC. In the ozonation of BCEE a 62.79% decrease of the $COD_{Cr}$ and a 57.25% decrease of the TOC lead to biodegradable by-products ($BOD_5/COD_{Cr}$ = 0.39). The results of this research show that wastewaters containing non-biodegradable compounds, such as BCEE can be successfully treated by ozonation followed by bio-treatment. The pseudo first-order rate constants of the ozonation was $2.00{\times}10^{-4}sec^{-1}$ and the activation energy was $10.02kcal{\cdot}mol^{-1}$ at $30^{\circ}C$.

Eveluation of Comparable Removal Efficiency of Organics and Color for the Dyeing Wastewater by Fenton Oxidation and Ozonation (펜톤산화와 오존산화 조합에 따른 염색폐수의 유기물질 및 색도 처리효율 비교 평가에 관한 연구)

  • Kim, Sun Hee;Lee, Sang Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.6
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    • pp.778-784
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    • 2004
  • Dyeing wastewater contains recalcitrant organics which can not be easily treated by conventional biological treatment. Therefore it has to be treated by other advanced oxidation process in order to remove COD and Color more efficiently. Fenton oxidation process is one of the most commonly applied processes in removal of COD and color for the dyeing wastewater. However it increase the treatment cost and the production of sludge by the use of the excessive chemical reagent. Ozonation is not suitable in Single treatment process because it is not effective in organics removal compared with Color removal. The purpose of this research in order to evaluate the comparable removal efficiency of COD and color by the combination of advanced oxidation processes for the dyeing wastewater. The sequential treatment processes of Fenton process and ozonation was more effective to remove organics and color than ozonation and Fenton process. The result of Fenton process for the pretreatment presented as the 81% removal of organics whereas ozonation process for the pretreatent presented as the 22.1% removal of organics. The removal of colour was higher as 81.3% for the ozonation as the pretreatment than 77.7% for the Fenton process as the pretreatment.